The astronauts replaced a space-to-ground communications receiver and wireless video equipment and installed power and cables for a Russian multipurpose laboratory module.

The spacewalk was terminated after just one hour due to an unexplained build up of water inside the space suit helmet of Luca Parmitano.

It was the first in a series of complex spacewalks in November and December 2019 to repair the Alpha Magnetic Spectrometer (AMS-02), They set up tools and equipment before removing a protective debris shield from the AMS-02.

They continued their work to replace a cooling system and fixed a coolant leak on AMS-02. Luca Parmitano and Andrew Morgan cut and label stainless steel tubes, of which there are eight.

Main task was to install a new pump module. The astronauts installed a bypass to the old thermal control system by attaching a new one off the side of AMS-02.

The main task was to carry out leak checks, make adjustments and then to re-installed insulation on AMS-02.